Mortise lock with latch bolt and locking bolt



Dec. 8, 1964 A. cREPlNsr-:K 3,159,993

MoRTrsE; Loox WITH LATCH Bour AND LOCKING Bom ATTORNEYS Dec. 8, 1964v A. cREPlNsEK 3,159,993

` MoRTTsE LCCK WITH LATCH BCLT AND LOCKING BOLT Filed 00T. 1B', 1961 s sheets-sheet 2 I6 n is h I H 3o l2 Le 44u23 loe t n. (1h35 #WW2 www l M2611] Il 42 hl lo 34 '.f q 11. 60 IU J1 1 l l l u INVENTOR l g l 28111 uoll 27 44 o 1li g8 g4 Ik L L .l l L "2| Alois Orepnsek ATTORNEY 5 Dec. 8, 1964 A. cREPlNsx-:K

MORTISE LOCK WITH LATCH BOLT AND LOCKING BOLT Filed Oct. 18, 1961 3 Sheets-Sheet 3 Alois Crap/niek ATTORNEY United States Patent 14 claims. (ci. 7e-1o7) This invention relates broadly to a mortise door lock having a latch bolt and a co-operating, but separate, locking bolt. More speciiically, both the latch bolt and the co-operating locking bolt are disposed in close proximity Within the lock casing and are both caused to operate from extremely simple driving means.

In many of the known mortise locks of this general nature the operating members for the latch bolts and the locking bolts have provided for only short locking bolt movements. Generally, the movement of the locking bolt from the lock casing is approximately equal to the movementv of the latching bolt from the lock casing. It is obvious that as the locking bolt provides the function of preventing unauthorized use of the door in which the mortise lock is set that it should have a greater discrimination with respect to forced entries. Such discrimination is provided in the present mortise lock by reason of providing a greater extension of the locking member from the casing than is present in other such mortise locks.

The prior art has suggested several ways to extend locking bolts further from the lock casing. Generally speaking, these proposals have been in the nature of various connecting linkages which not only multiply the number of parts necessary but also grossly complicate assembly and disassembly of the door locks in which they appear. These types of linkages also require a fairly large space consideration within the mortise lock casing which then increases the size of the casing and limits the minimum size and Width of doors in which these locks may be advantageously placed.

Another general characteristic of this type of mortise lock to be found in the prior art is that the latch bolt and locking bolt linkages mutually interfere with one another which causes the impossibility of the closer relationship of the locking bolt to the latch bolt. These same considerations, of course, also cause vthe movement of both the latch bolt and the locking bolt to be restricted due to space considerations.

in the applicants copending application,. Serial No. 856,617, tiled December 1, 1959, and now Patent No. 3,966,523, there has been described a mortise lock in which a rotatable cylindrical locking member is positioned within iixed bearing sleeves within the casing so that this member may be operated from drive means contained in knobs on either side of the door in which the lock is placed. It was found that in this mortise lock placement of an additional locking means such as the locking bolt of the present application, was extremely diicult.

It is, therefore, an object of this invention to provide a mortise lock which combines in a minimum number of working parts the advantages of a mortise lock which contains both a locking bolt and a latch bolt in close co-operation with one another. Y

Another object of this invention is to provide a mortise lock which contains therein a latch bolt co-operating with a locking bolt in such a manner that the latch bolt is partially or completely surrounded by the locking bolt.

A further object of this invention is to provide a mortise lock having a variety of particularly shaped locking bolts.

c i ananas 1C@ Still another object of `this invention is to provide a mortise lock in which the latch bolt and the co-operating locking bolt are operable independently of one another by reason of kthe operation of members which are dis,- posed one within .the other. A further object of this invention is to provide a mortise lock of this nature. in which the total number of parts necessary for operation thereof is much less than the total number of parts normally required for such mortise locks.

Yet another object of this invention is to provide a mortise lock which is of simple and durable `construction and which provides parts which are easily manufacturable and easily assemblable and disassemblable and which at the same time'observe economy in the number thereof.

settingrforth in both side walls of a mortise lock casing fixed bearing sleeves. Between these bearing sleeves a rotatable intermediate sleeve is iixed. Rotatable drive sleeves are placed about the bearing sleeves and knobs secured to the ends thereof. Drive means for effecting rotation of a rotatable elongated shaft member are positioned in each of the knobs. This rotatable elongated shaft member then extends through said lock casing within the tubular bearing sleeves. The rotatable longitudinal locking member has a configured middle portion Which is mated with a conigured portion in the rotatable intermediate sleeve. member, the intermediate sleeve causes a connection linkage to transmit rotary motion into'linear motion in order to operate the extension of the locking bolt. Within the locking bolt or in close cooperation therewith is positioned the latching bolt which operates by reason of the rotatable drive sleeves extending into the mortise lock casing and operating the spring vbiased latch bolt through the latch bolt frame which is connected to the rear of said latch bolt.

The above objects and advantages Vof this invention and the brief description thereof will be apparent from the following description and claims.

In the accompanying drawings which illustrate by Way of example various embodiments of this invention;

FIGURE 1 illustrates a irst embodiment of the present invention by a horizontal cross sectional view of the mortise lock;

FGURE 2 isl a perspective view of the latch bolt andlatoh bolt frame; l' Y FIGURE 3 is a irst embodiment of the locking bolt shown in perspective view;

FIGURE 4 is a vertical sectional view of the present invention taken on the line IV--IV of FIGURE l in which the rotatable longitudinal locking member and the tubular bearing sleeve portions have been removed therefrom and in which a modiiied form of the locking bolt is shown in retracted and non-locking position;

FIGURE 5 is a vertical sectional view of the mortise lock as shown in FIGURE 4 in which the locking bolt is shown in extended and locking'position;

FiGURE. 6 is an exploded perspective view of the bearing sleeve portions and another modified form of locking bolt together with the rotatable drive sleeves shown in partial cross section and positioned with respect to the bearing sleeve portions; and

FIGURE 7 is an exploded perspective view of the rotatable elongated shaft member which is designed to iit inside of the tubular bearing sleeve portions, showing the vrelation to its two drive means.

Referring now to the drawings for the detailed description of the'mortise lock, FIGURE 1 shows a lock casing 1u which is designed to be set into a door at the latching height. Reciprocally retained within the lock casing 10 ?atented Dec. 8, 1964` Upon rotation of the elongated shaftA operating locking bolt 14. These two elements of the invention are best shown in FIGURES 2A and 3, respectively.

Latch bolt and latch frame assembly 12 consists of a'latch`bolt 16 into whichisatliked a latch bolt frame 18. Thev connection'between the'two is best shown in FIG- URE 2. The latch bolt frarne`18'is`constructed to have a longitudinal slot.ZUeXtending'completely through the mid-portion thereof which is constructed for a' purpose which will be hereinafter explained. The latch bolt frame 18`is further constructed to have inner abutments 22 upon" which force is applied in order to retract the latch bolt 16 froml latchingposition. Connected to the inner ends of innerY abutments 22 are U-rnemb'ers 24 which serve to'maintain the latch bolt frame'18 in a rigid relationship tothe other elements of the mortise lock.

A' guide pin 26 is securedto the'rear portion of latch bolt 16' and'co-operates with" a" stationary bracket 27 which is pressed from the side wall of lock casing 10. Spring 28 isk positioned; about guidepin 26 and abuts against stationary brackett 27 and the rear side of bolt 16 in order to resiliently'urgelatch bolt 16 into latching position.

Locking bolt 14is shown positioned within casing 10 and surrounding latclibolt; and latching frame 12. The locking bolt 14 consists of two plate shaped longitudinal members 30'and32, best shownin FIGURE 3, which are held rigid by two means. The first of these means is lateral wall 34 and the second of these means is transverse bar 36. It is apparent that either one or both of these means may ber eliminated and` the necessary structural rigidity'preserved.

The operation of the locking bolt is performed by means of connection linkage 38 whichk is pivotally connected between transverse bar 36'- and radial arm 40. Radial arm 40- extends outward'y from rotatable intermediate sleeve 42 which is designedtobe rotated by a means hereinafter described@ Referring now tothefinner abutments 22 of the latch bolt frame 18itv is seen that they are contacted by inner projections 44 which are connected to rotatable drive sleeves 46 which are connected inY turn to latch knobs 48-and-S0. Both latch" knobs are constructed withan internal tubular seeve 52 and 54 respectively. These internal sleevesare disposediin contact about rotatable drive sleeves-46 andare secured thereto so asto transmit rotaryl motion from the latch knobs 48- and 50 to the rotatable drive sleeves and, hence, tothe inner projections 44 which then contact the inner abutments 22 of the latch bolt frame 1-8.l It can be seen that by turning either of latch knobs 48 or 50 in either rotary directionthev latch bolt 16 is retracted against the resilient force of spring 28 by means of this contact.

Locking bolt 14 is reciprocated bymeans of rotary motion transmitted from-rotatable intermediate sleeve 42 for transmitting rotarymotion through radial arm 40 and is converted into linear motionby'means of the pivotal connections on either end of connection linkage 38.

Rotatable intermediate sleeve 42 is rotated by meansV of rotatable elongated shaft member 56 which has a configured middle' portion 58 which mates with a like configured internal portion of central passage opening 60 of rotatable intermediate sleeve 42. By means of rotation of the rotatable elongated shaft member 56 the middle portion 58fcauses rotatable internal sleeve 42 to rotate.`

Rotatable elongated' shaft member 56 is constructed with transverse slots 62` cut' into both' ends thereofV and two securing circular grooves 64 positioned toward the center from` slots 62.

In order to rotate the elongated shaft member 56 from the inside end thereof theinside latch knob 48 is provided with aV turn handle 66 which is secured rotatably and axially at the inside end of the opening of tubular sleeve S2 and to which is connected a first drive member 68 which extends into the associated tubular sleeve 52.Y

Drive member 68 has connected to the end thereof a second drive member 70 which is designed to enter nearest slot 62 of the elongated shaft member 56. By rotation of the top portion of handle 66 (as shown in FIGURE l) the drive member 68 andthe secondary drive member 70 cause elongated shaft member 56 torotate to cause locking bolt 14 to move into locking position from the lock casing 10.

Likewise, the outside latch knob 50 isl provided with a means to rotate to elongated shaft member 56. This means consists of a cylinder tumbler lock 72 whichis constructed with a cut away projection 74 on the inner end thereof. Projection 74Y is positioned adjacent to plate member 76 which is retained in nearest slot 62 of the elongated shaft member 56. Plate 76 is constructed with a depending portion 78 which contacts the projection 74 during rotation thereof in one direction. The absence of such a depending projection 78 from the bottom portion of plate 76' permits that plateto bey rotated .by means of rotation of the elongated. shaft member without contact with the projection 74. However, projection 74 will operate to rotate the elongated shaft member 56 if rotated in a direction so that depending member 78 is abutted against projection 74.. Plate member 76' operates as a disconnected projection of tumbler lock 72.

The rotatable drive sleeves 46'and the rotatable elongated shaft member 56 are supported and held in operable position partially due to` tubular bearing sleeves 80 and 82, respectively. These tubularbearing sleeves are rigidly held in lock casing'78 and'have positioned thereon at the inner ends thereof sleeve portions 84 and 86, respectively, positioned upon tubular bearing sleeves 80 and` 82; These inner sleeve portionsl are constructed with counter-sunk portions 88 which tit over reduced inner endportions90 and 92 of tubular bearing sleeves 80 and 82,.respectively. Slots`94`and 96, shown in FIGURE 6, are positionedl at the connection of the bearing sleeve portions and the inner sleeve portions in order that tongue members (not shown) depending from the openings in the lock casing l'may coact therewith t0 prevent rotation.

Outer tubular bearing sleeve projections 98 and 100 are securedrespectively to the outer ends of tubular bearingsleeves 88 and`82, respectively, by means of'y set screws 102 and 103. In order to provide ease ofremoval of these set screws slot 104- is provided in the inner tubular latch knob projection 52 and the drive sleeve 46 secured thereto and aperture 105 is provided `in inner tubular latch knob projection 54 and the drive sleeve 46 secured thereto.

It will be seen that as the tubular bearing sleeve portions 80 and 82 are secured against rotary movement and longitudinal displacement they are secured within the door by means of their co-operation withy lock casing 10 so that they provide support for the rotary members 46 and 56'.

Referring now to FIGURE 2, the latch bolt and latchV bolt frame assembly 12 isshown in perspective view and composed of a latch bolt 16 secured to the latch bolt frame 18. A longitudinal slot 20 is cut around the entire Referringnow `to FIGURE 3, the lock'bolt 14 is shown in perspective view and consists of plate shaped longitudinal members 30 and 32 which are held in rigid relationship to one another by a first means consisting of a lateral wall 34 and a second meansr consisting of a transverse bar 36. To this bar 36` or to another suitable portion of the lateral wall 34 a connection linkage 38 is connected which tr-ansmits motion from the elongated shaft member 56, as explained in the description of FIGURE l.

It is not the intention of the applicant to limit his invention to the specific conligurations of the latch bolt land latch frame assembly and the locking ybolt shown in FIGURES 2 vand 3. Other shapes of latch bolt and frame assemblies can be used and of course, would require co-operating configurations in the locking bolt.` At the same time, it would not be necessary for the locking bolt to partially `surround the latch bolt and latching frame assembly. The locking bolt could be positioned immediately adjacent rather than partially surrounding as is shown in Ithe drawings herewith.

Referring now to FIGURE 4, the vertical sectional view in which the rotatable elongated shaft member 56 and the tubular bearing sleeve portions 82 and 86 are removed shows the co-operation `of the latch bolt and latching frame assembly 12 in co-operative arrangement with locking bolt I4. Both of these members are positioned within lock casing which is secured at the rear portion thereof by stud bolts 106 and 108, which are also shown in FIGURE l. The latch bolt fname 1S is Ashown disposed between the longitudinal members 38 and 32 of locking bolt 14. Lateral wall 34 may be seen in plan view.

In this figure the transverse bar 36 of FIGURE 3 is replaced by extension 110 which is secured to the rear portion of lateral Wall 34. To this extension connection linkage 38 is pivotally connected and is then pivotally connected onto radial arm 40 of the rotatable intermediate sleeve 42. The configured central passage opening 60 of intermediate sleeve 42 can, also, be seen.

The co-operation of inner projection 44 of rotatable drive sleeve 46 with the two inner abutments 22 of the latch bolt frame 18 may -best be seen in this ligure. By rotation of inner projection 44 the latch bolt frame 18 is withdrawn from latching position against the force of spring 28.

Slot 112 may be seen in the lock casing 10 which provide for movement of the inner projection 44 on the inside of the lock casing over an angle of approximately 90.

Referring now to FIGURE 5, this ligure shows sub- Stantally the same showing as FIGURE 4 except that the locking bolt 14 is in extended or locking position and positioned co-operatively about latch bolt 12. The intermediate rotatable sleeve 42 has been rotated 180 counter clockwise and thus the radial arm 40 extends to the left rather than to the right and the arcuate shaped connection linkage 38 is shown in full extended position rather than in overlapped position `as shown in FIGURE 4. The arcuate nature of the connection linkage is necessary in order to provide inner fitting relationship with the intermediate rotatable sleeve 42. It should be noted that by reason of this unique co-operating nature of the parts shown here and described here the locking bolt 14 may be extended -a greater distance than is normally available in other types of locks.

lt can easily be seen that latch bolt 16 could be positioned out of the plane of the paper in FIGURES 4 and 5 and the nearest portion of the locking bolt 14 could be positioned within the paper and a suitable latch opening could be designed in the door Casement for cO-operation with these coniigured parts. Thus the parts shown are not restricted in width position and relationship nor are they restricted in longitudinal placement and relationship as has been hereintofore mentioned.

Referring now to FIGURE 6, locking bolt 14' consists of longitudinal plate shaped members 30' and 32 which are secured one to another by transverse bar 36'. It is to be noted that there is no lateral wall in this latch bolt.

The latch bolt 14 is shown in extended or locking position through a front portion or face plate of casing 10. The connection linkage 38 as shown in full extended position as the radial arm 40 is positioned toward the opening of the lock casing 10. The inner sleeve portions 84gr and 86 which support the intermediate radial sleeve 42- for rotary motion within the lock casing 10 are shown on either side thereof. These inner sleeve portions are in turn connected respectively to-ends 90 and 92 of the tubular bearing sleeve portions 80 and 82, respectively. The slot arrangements 94 and. 96 can be seen in this figure. 'I'hese slot portions co-operate with tongues (not shown) Vvwhich depend from the openings through which the tubular bearing sleeves pass in the lock casing 10.

The rotatable drive sleeves 46 which zare connected at either end thereof to the -latch knobs 48 and 50 are shown with the inner projections 44 depending therefrom. Within the rotatable du've sleeve 46 shown in the lower left hand corner the tubular bearing sleeve extension 98 can be seen. Access slot 104 in the rotatable drive sleeve 46 can, also, be seen. As will be recalled from the desci'iption of FIGURE 1 this slot is positioned to aid in yaccess to the securing set screw 102.

Referring now to FIGURE 7, this gure is a perspective view of .the rotatable elongated shaft member 56 and shows the configured middle portion 58 and the slots 62 which are positioned at either end thereof. The securing grooves 64 are shown at either end thereof for co-operation with set screws 102 and 104, as previously explained.

The secondary drive member 70 is shown in exploded relationship with respect toits slot 62 in the elongated shaft member. nects to the first drive means 68 in the inside latch knob 4S. 0n the opposite end of the elongated shaft member S6 i-s shown plate 76 in position in the transverse slot 62. As can be appreciated from this view the cylinder tumbler lock 72 and its cut away projection 74 co-operate with plate 76 and the depending portion 78 so that when rotatedfin a first direction bythe movement of the key in the cylinder tumbler lock projection 74 a-buts against depending portion 78 and turns the entire elongated shaft member 56 so that movement of locking bolt 14 is effected. In this mortise lock the cylindrical tumbler lock 72 permits movement in both rotary directions in` 180 and necessitates return to the initial position in order to retract the key. The return motion by the operator 'in order to retract the key then positions the projection 74 for the next key driven action. n

A description of the iaction of the co-operation of projection '74 with depending portion 78 is as follows: The exploded perspective views of FIGURE 6 and FIGURE 7 if taken together show the locking bolt 14 in extended position and the cylinder tumbler lock portion 72 at inoperative position. Assuming the operator is onthe inside of the door and wishes to go out of the door and leave it locked he then rotates the drive member 70 in a counter clockwise direction this then retracts locking bolt 14 and positions depending portion 78 in a downwardly direction against the bottom portion fof projection 74. The voperator then goes through the door closes it and proceeds to rotate the tumbler lock by use of the key 180 counter clockwise fashion this then rotates the elongated shaft member 56 around to the position shown in FIGURE 7 wherein the depending portions 78 is upward as shown. However, this leaves :tumbler lock 72 rotated 180 from the position shown so that projection 74 is on the opposite side of plate 76. The operator must then rotate the key 180 in 'the opposite direction in order to retract it. This positions .the tumbler lock '72 las shown in FIGURE 7. When the operator then returns to unlock the door the tumbler lock 72 is rotated in a clockwise direction 180 which positions the depending portion 78 in a downward direction he then rotates the keys 180 in order to retract and the tumbler lock v is left as shown in FIGURE 7. The rotatable elongated This secondary drive means70 con,-v

. l perspective viewsl by rotating the the inside handle-66, ,180 in a clockwise direction. It is seen that the'axes' of member 56and the pivot connection`V of linkage 38 nowV define; anY approximate dead' center line..

From the foregoing it is `obvious 'that-theconfig'zurationV drivei member v.70 from Y i and shape ofthe latch boltand latch boltrframe'assernt bly 12 can be configured in difierent'mannerswitli respect to the'conguration of thev co-operatinglocking'bolt 14. Particularly, thelocking'bolt may be made without the transverse bar or without the lateral wall as is shown respectively, inFIGURES 44 and 6.

contemplated by the present invention as can be seen through these drawings and the'associated descriptions.

Likewise, no particular configuration of theY central.

passage 60 and co-operating middle portion 58 need be observed, as long as some irregularity from circular conguration 'is complied with.

It is obvious, also, that many of thespecitic connection means shown inthe drawings and described'are not'essential' to the connection ofthe various parts'and .that other connection means can easily be used and the'scope of the invention not altered. For instance, the'connection of.

transverse bar 36 with plate shapedlongitudinal' members and 32 need not be aslot type connection asV shown but may be a welded connection'on the inner surfaces thereof. Likewise, the joint'ofithe latchingfrarne 18 to the latch bolt 16 need-not` be-as shown but` may be of anotherl type.y Also; the slot` association ofsecondary drivernember 70 with slot'62iand plate member 76.

with slot 62 of elongated shaft member 56' need not be specifically as shown.

While the invention has been described in'conne'ction. with different embodiments thereof, it Will`be` understood` that itis capable of further modification, and this'application is intended to cover anyvariations', uses; or adaptatlons of the invention following; lin general', the principles.

of the invention and including suchldeparturesifrorn the present disclosure a-s come within known` or customary practice in the art to which theinvention pertains, and as may be applied to the essential'features hereinbefore. set forth as as fall within the scopeA` of' the invention or the limits ofthe appended claims.

1 claimt 1. A mortise lock comprising:

(a)` an elongated thin-walledilocle casing having a front' face with anY opening therein; (b) a lock and latch bolt assembly disposed within said casing in telescoping engagement with the casing.4

wall so that it may protrude through said opening when in locked position, the latch'bolt andplocking bolt of said assembly being in freely'sliding reciprocable engagement with each other;

(c) the latch bolt of said assembly being spring-biased so that it normally protrudes out through said opening in saidfront face;

(d) the said locking bolt being heldin withdrawn position behind saidopening of said-front face, andbeing forwardly movable to extended locked position through said' opening in said frontrface;`

(e) two rotatable drive sleeve members, one disposed on each sideof said casing, and eachhaving a portion thereof which extends through the casing wall,

the rotation of saidportion actingto move said latchV bolt for effecting retractionthereof; (f) anv elongated rotatable; shaft member whichk extends transversely through said casing behind said.`

locking bolt and into each of'. said sleeve members Itis also Y obvious that by use-of eitherl a partial lateral wall at'the. rear most end of the locking boltor by use ofaY partial 2. The'mortiselock' as set forth in claim 1, whereiny said rotatable link member isa radial arm whichis integral with a rotatable intermediate sleeve mounted on said elongatedrotatable shaft member.

said locking bolt, and said rotatable link member moves, through an arey greater than forty tive degrees.

4. The mortise lock as set` forth in claim 3,.wherein said connection link length is .approximately twice that of' said rotatable link, and said rotatable link is moved through'an'arc of'approximatelyone hundred and eighty degrees.

5. AA mortise lock comprising:

() an elongated' thin-walledl lock casing having top, bottom, and'side' walls andan open front end, the topand'b'ottom walls being of substantially smaller dimension thansaid side walls, and the height `of saidsid'e walls being substantially smaller than the length lof'said casing;v

(b) snout-turned flange disposedin the'plane transverseto-the front end of said casing and'integrally connected to said casing;

(c) a lock bolt telescopicallyy fitted within said casing and in engagement; withsaidwallsso that it may readily be moved to extend outward through said open front end of the casing;

(d) said lock bolt havingI a longitudinal'hollow sec- Y tion extending fromthe'front of saidcasing and being Y open along one side of said lock bolt;

(e) a latch'boltl telescopicallyl iitted'-within said longitudinal hollowl section'of said lock boltV and freely reciprocable therein; said latch bolt being springbiased to normally protrude through said open end of the casing, and having aat side which is disposed at said open side oftsaid lock bolt and adjacent the correspondingA side wall of the casing;

(f) a hollow elongated rotatable drive assembly having a door knob atthe endy thereof and having its other endextending through said casing, rotation of said drive assemblyfacting to move said latch member to effect withdrawal ofsaid latch member into said casing upon rotation of said drive assembly;

(g) an elongated rotatable shaft member which extendsV transversely through said casing and projects into said hollow rotatable drive assembly; and

(h) mechanical moving'means` disposed within said casing and directly connected to said elongated rotatable shaft member and to said lock bolt so that rotation of said rotatable shaft member in one direction will move said lock bolt to an extended locking position through said open front end of the casing, and reverse rotation of said rotatable shaft-member will withdraw said lock bolt into the casing.

6. A mortise lock as set forth in claim 5, wherein the casing is ofuniform cross section through out its length.

7. The mortise lock as setforth in claim 5, wherein said mechanical movingk means includes a rotatable link member which is connected to said elongated rotatable shaft and is rotatable therewith.

8. The mortise lock as set forth in claim 7, wherein said rotatable link member is a radial arm integal with connected to a turning a rotatable intermediate sleeve which is mounted on said elongated rotatable shaft member.

9. The mortise lock as set forth in claim 7, wherein said rotatable link member is pivotally connected to a connection link which is directly connected to said locking bolt, and said rotatable link member moves through an are greater than forty tive degrees.

10. The mortise lock as set forth in claim 7, wherein said rotatable link member is pivotally connected to a connection link which is approximately twice the length of said rotatable link member, and said rotatable link is moved through an arc of approximately one hundred and eighty degrees.

11. The mortise lock as set forth in claim 7, wherein said elongated rotatable shaft member is supported within a bearing sleeve which is fitted within said hollow rotatable drive assembly.

12. The mortise lock as set forth in claim 7, wherein the casing has an arcuate slot through which the said other end of said hollow rotatable drive assembly projects to engage said latch bolt.

1.9 13. The mortise lock as set forth in claim 12, wherein said rotatable link member is pivotally connected to -a connection link which is approximately twice the lengthv References Cited in the file of this patent UNITED STATES PATENTS 315,456 Wurm- Apr. 7, 1885 929,638 Voight July 27, 1909 1,025,850 Young May 7, 1912 1,159,635 Vv/Olfe et al. Nov. 9, 1915 1,687,248 Hurd Oct. 9, 1938 

1. A MORTISE LOCK COMPORISING: (A) AN ELONGATED THIN-WALLED LOCK CASING HAVING A FRONT FACE WITH AN OPENING THEREIN; (B) A LOCK AND LATCH BOLT ASSEMBLY DISPOSED WITHIN SAID CASING IN TELESCOPING ENGAGEMENT WITH THE CASING WALL SO THAT IT MAY PROTRUDE THROUGH SAID OPENING WHEN IN LOCKED POSITION, THE LATCH BOLT AND LOCKING BOLT OF SAID ASSEMBLY BEING IN FREELY SLIDING RECIPROCABLE ENGAGEMENT WITH EACH OTHER; (C) THE LATCH BOLT OF SAID ASSEMBLY BEING SPRING-BIASED SO THAT IT NORMALLY PROTRUDES OUT THROUGH SAID OPENING IN SAID FRONT FACE; (D) THE SAID LOCKING BOLT BEING HELD IN WITHDRAWN POSITION BEHIND SAID OPENING OF SAID FRONT FACE, AND BEING FORWARDLY MOVABLE TO EXTENDED LOCKED POSITION THROUGH SAID OPENING IN SAID FRONT FACE; (E) TWO ROTATABLE DRIVE SLEEVE MEMBERS, ONE DISPOSED ON EACH SIDE OF SAID CASING, AND EACH HAVING A PORTION THEREOF WHICH EXTENDS THROUGH THE CASING WALL, THE ROTATION OF SAID PORTION ACTING TO MOVE SAID LATCH BOLT FOR EFFECTING RETRACTION THEREOF; (F) AN ELONGATED ROTATABLE SHAFT MEMBER WHICH EXTENDS TRANSVRSELY THROUGH SAID CASING BEHIND SAID LOCKING BOLT AND INTO EACH OF SAID SLEEVE MEMBERS WHERE EACH END THEREOF IS CONNECTED TO A TURNING MEANS; AND (G) A ROTATABLE LINK MEMBER CONNECTED TO SAID ELONGATED ROTATABLE SHAFT MEMBER AND ROTATABLE THEREWITH, SAID LINK BEING MECHANICALLY CONNECTED TO SAID LOCKING BOLT WHERBY TURNING OF SAID ELONGATED ROTATABLE SHAFT MEMBER IN ONE DIRECTION WILL ROTATE SAID LINK AWAY FROM SAID LOCKING BOLT TO THEREBY MOVE SAID LOCKING BOLT TO WITHDRAWN POSITION, AND REVERSE MOVEMENT OF SAID ELONGATED ROTATABLE SHAFT MEMBER WILL EXTEND SAID LOCKING BOLT TO LOCKED POSITION. 